Dithieno[3,2-b:2',3'-d ]pyrrole and Benzothiadiazole-Based Semicrystalline Copolymer for Photovoltaic Devices with Indene-C sub(60) Bisadduct

A semicrystalline low-bandgap polymer (PDTPBT) based on alternating dithienopyrrole and benzothiadiazole moieties as a pair of the indene-C sub(60) bisadduct (ICBA) for polymeric solar cells is reported. The lowest unoccupied molecular orbital (LUMO) level of PDTPBT is measured to be -3.47 eV, ensur...

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Bibliographic Details
Published in:Macromolecular chemistry and physics 2013-09, Vol.214 (18), p.2083-2090
Main Authors: Lee, Wonho, Kim, Gi-Hwan, Jeong, Eunjae, Wang, Xiaowei, Yum, Seungjib, Ko, Seo-Jin, Hwang, Sungu, Kim, Jin Young, Woo, Han Young
Format: Article
Language:English
Subjects:
Copolymers
Crystal structure
Molecular orbitals
Offsets
Order disorder
Photovoltaic cells
Separation
Solar cells
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Summary:A semicrystalline low-bandgap polymer (PDTPBT) based on alternating dithienopyrrole and benzothiadiazole moieties as a pair of the indene-C sub(60) bisadduct (ICBA) for polymeric solar cells is reported. The lowest unoccupied molecular orbital (LUMO) level of PDTPBT is measured to be -3.47 eV, ensuring sufficient energy offset for photoinduced charge transfer to ICBA. Photovoltaic cells are fabricated with ICBA and [6,6]-phenyl-C sub(71)-butyric acid methyl ester (PC sub(71)BM) as an acceptor. By replacing PC sub(71)BM with ICBA, the open-circuit voltage is increased by 0.23 V and the resulting power conversion efficiency is improved from 1.17% to 1.71%. To optimize the ICBA-based devices, crystalline low-bandgap structures should be designed carefully as a pair of ICBA by considering the energy-level offset for charge separation and crystalline interchain ordering, for minimizing the intercalated ICBAs inside the polymer domain. A semicrystalline copolymer based on dithienopyrrole and benzothiadiazole is investigated as an active layer with the indene-C sub(60) bisadduct (ICBA) for photovoltaic devices. A low-bandgap structure should be carefully designed as a pair of ICBA by considering the energy level offset for exciton separation and crystalline ordering for minimizing the intercalated ICBAs inside the polymer domain.
ISSN:1022-1352
1521-3935
DOI:10.1002/macp.201300303